My mom's probably not gonna like that I put this out there, but I'm going to anyway because you need to know how your words make people feel. She said that you're not someone she'd want to meet because you sound judgemental, intolerant, etc. Bottomline is that people like him are not doing anything wrong, so why can't you just be okay with it? You are a pony person, so you *should* understand, but apparently you don't, just because his interest in ponies is done in a different way than yours. It's no different than if a brony makes fun of you for liking ponies that are not G4s....
If I was your mom, I wouldn't be super-happy right now. If someone put everything that I said on a public forum, I would not be a very happy camper. People say things, instead of posting them, for very good reasons. For myself, I know I say some pretty heated things in real life sometimes, so when I post, I try to choose my words carefully and think more before I type. It is probably the same for your mom, and so I would avoid speaking for her in the future, if I were you. If you feel the same way as your mom, then simply say what you think, instead of parroting her. You might also get people upset at her, which isn't fair at all, because she never might have intended to say such a thing, or in the same way you did!
With all of that said, I think saying that someone is not allowed to say someone's actions are 'creepy' is a bit much. A lot of us have 'gut feelings' about people, and if we get weird vibes from them, or think they're 'creepy,' oftentimes it's our unconscious trying to keep us safe. For example, I've met Bronies who were gentlemen, Bronies who were silly (and polite), and Bronies who set my hair standing on end for reasons I couldn't explain. Would I want to be caught in a dark alley with the latter? Heck no, because my gut is telling me that I don't feel safe around them. Even if my conscious mind isn't picking up on it, unconsciously I am picking up nonverbal cues that this guy is possibly dangerous.
It's not 'wrong' to feel creeped out by someone - it's a little insulting, yes, but sometimes it's just a missed social cue, or getting off on the wrong foot, and it's easily fixed. If you say, 'All bronies are creepy,' then that's not right, because no one has ever met every single brony. But it's okay to find people you've met creepy, especially if you don't know them well, I think. If you instead try to pretend like everything is nicey-nice, then you might be putting yourself in danger, which is never a good idea.
I hope that makes sense. I know no one was making the point that 'all bronies are super-duper creepy' here, but I just wanted to clarify. Personally, I try not to police people's reactions, unless it's bordering on harassment. But one person saying that one Brony was kind of creepy when she watched an episode with him? Not harassment.
blah blah blah HORRENDOUS MISSTEP Everyone knows that Fluttershy's heart belongs to Big Macintosh.
I think your finger slipped there, you clearly meant to put
Caramel's heart belongs to Big Macintosh! That's okay, it's an easy mistake to make, I forgive you. ;]
(Kidding, kidding, haha!)
And wow I sure like to type a lot, sorry. I have some experience meeting Bronies (hi guys!) so I have a lot to say, I guess!
With all of that said, I have met a bunch of really friendly Bronies of various ages, and the majority of them were really fun, peppy guys! I'd love to meet more female Bronies, of course, but generally the Bronies that I've met have been very friendly and welcoming. The ones online are another matter (since they tend to stick their hooves in their mouths VERY often, in as offensive ways as they can, it seems...), but in real life, the majority have been very sweet and polite with me. :] So even if you've met one rotten Brony, don't let one bad apple spoil the bunch!