I think it’s also worth pointing out that complaining about labels - particularly in the context of complaining about other people using them - almost always comes from a place of privilege.
It’s so easy to say ‘why do you need to label yourself, why can’t you just get on with it without making a big song and dance’ when your sexual orientation is the one that is automatically assumed. Of course you don’t feel a need to label yourself as straight when everyone already assumes that you are, and when you see your orientation freely expressed everywhere, represented in the media and presented as the ‘normal’ one.
I bet you would be a little more keen on labels if everyone actually assumed you were gay or bisexual unless you told them otherwise. You might be keener to find a community of other straight people if you hardly ever saw straight relationships portrayed on tv (and if, when you did, they tended to be portrayed as tragic, damaged or oversexualised). You might want to find others like you if you knew that a sizeable portion of the world considered you a criminal for being straight, or thought you needed therapy, or dismissed it as a mental illness.
‘Labels’ often help people to express pride in who they are, to find others who share their experiences, to identify resources / art / literature which allow them to explore parts of themselves, to share elements of their identity with others, to be understood, to challenge stereotypes, to educate others. It’s not for straight people to decide that labels are harmful when they’re lucky enough to live in a world where their sexuality happens to be the one everyone assumes as a default.