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Well I've read through the comments and since you are pretty stubborn about this, here's my advice:
Just deal with it. You can't change reality. The Rainbow is a gay symbol and it's here to stay. Either deal with the little amount of prejudice that comes with it or stop using rainbows.
It doesn't matter that "they shouldn't have taken it in the first place" or that you think "they should use a entirely new flag/symbol" because they didn't and they won't.
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To add my two cents to your actually problem tho: There is no harm done by the LGBTQ+ community using the rainbow. Some might feel a bit weird using it or be scared of being called gay but those a such minor complaints that they don't warrent the enormous expenditure that would be changing such an iconic symbol of such a huge community.
Otherwise everyone could say they didn't like universal symbols like the cross as a symbol of christianity, the moon and star as a symbol of turkey, everysingle chinese zodiac animal as a symbol of its year and the respective communities would have to change it just like that. People that are bothered by symbols have to either deal with the assoaciation or stop using the symbols.
Sounds like your issue isn't with Rainbows themselves, but peoples ignorant attitude towards a rainbow. Nothing stopping you enjoying/using rainbows. >

Yes, but the main thing stopping the use of rainbows is the prejudice that comes with it >

What prejudice do you mean? Can you give a direct example of it? >

People assuming that everyone using them is part of the LGBTQ community >

Oh cool so about the least prejudicial prejudice going then.
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This should only really bother you if you have an issue with gay people. >

I strongly disagree with this, if people are prejudiced about which groups you belong to, you're allowed to be bothered
Same thing applies to gay people that people are assumed to be straight, it's okay to be bothered by that
Same when someone incorrectly assumes your gender, people usually dislike that regardless of you're cis or Trans
Don't minimize people's experiences with prejudice >

Sure you can be bothered but being bothered is one thing and wanting to claim all rainbows for yourself because people may associate you with the gays is another thing and kinda psychotic. >

Where did OP say that? I just saw them say they don't want people to be prejudiced towards them, which seems reasonable >


I just want my rainbows back, I want to be able to use rainbows for designs and fun stuff, without all the prejudice that comes with it. >

Sounds like the stuff you bolded could be interpreted like wanting all rainbows for himself, except the rest of the sentence clarifies the meaning