If someone you know is pro LGBT is it more likely they're gay/bi etc?

I have a cousin (M) who was visiting and the other day he started to get defensive when our gran made a little joke about pride month which I think he took out of context,

before he's never really had an opinion about the group and so wouldn't really be fazed. I know him well and I've never seen this side of him and nor had anyone else so I was intrigued when he almost starting arguing lol.. so maybe he has friends that are lgbt and he's standing up for them? or maybe he is too. or a really good straight ally... I know he said in confidence to me that he attended his first pride this year and said he had fun watching the parade, meeting new people etc.
If someone you know is pro LGBT is it more likely theyre gay/bi etc?
If someone you know is pro LGBT is it more likely they're gay/bi etc?
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