Got accused of ace larping for nothing

Hello everyone. Sorry if there is mistake in my writing English is not my main language.

So I was just enjoying a little game of LoL, when in the tchat someone ask me for my sex. As a joke because it was a strange question and because I'm never serious I respond "Not before marriage". Which was funny to me, but just after they both came on me and said "Why are you saying that when you got a asexual flag as a profile picture?? Wtf asexual larping". I totally forgot that that was my profile picture so I didn't see anything else than my joke. I than tried to explain to them that it's not because you don't feel sexual attraction that you will never have sex like if I want to have kid or for other reasons. They continue to came hard at me like "You're lying", "As a transfem I don't claim you as lgbt", "Asexuality is the easiest to larp", etc... I was confuse as to why they talked like they knew me better than myself and a little disheartened because once again I had to fight to prove who I was and that I was valid. They then began to ask me for my discord, start to saying that I was contradicting myself and when I try to say that once again it was the lgbt community that was going against an ace for nothing they came harder on me saying that it was nonsense. They even start saying "You're the kind of person that don't believe non-binary exist" (??????) wtf I don't know you we talk 10 lines in 5 minutes. I blocked them from everything because they want and ask me as a friend and even to search for my discord. I still don't understand why someone would want to larp asexuality like it's a cool thing and not just something that half the world don't know about...

I'm so tired of having to explain and prove who I am or what I feel. As a community, I think that every lgbt person went through enough self doubt and search of oneself to not be doubt and belittle by any other person of the community. Just be kind.

Sorry for the long text, I just need to vent

https://redd.it/1x5a7ev
@asexualityonreddit