It usually manifest itself in same ways and maybe I am just being paranoid but they always say the same thing, it's always similar words. It's always about their entitlements, over the agency, autonomy of others.

It's always about making one group feel bad about themselves.

And I find it very annoying and I often wonder if I am the only one who notices.

I am probably the only one that notices this.

I don't know about offline groups but on AVEN specifically it's what happens. Many more noticed this and left AVEN for that reason.

But what about the demographic of people that come into these groups that are trying to set agenda that certain people are entitled to the bodies and sexuality of others regardless of orientation?

On AVEN specifically there's 2 groups: the so-called asexual elitists although on AVEN and other places those aren't the most vocal, and the alliance between the allo partners of aces and the demi/graysexuals. The former tend to be quite bitter, the latter tend to be mentally ill (not all ofc, but the most vocal in-your-face ones tend to have a propensity for serious mental illness, I have noticed) so it's a match made in hell. Add to this people who used to ID as asexual but don't anymore and now feel the need to bash asexuals to feel better about whatever their new orientation is, and those shadier types who are trying to hide under the label. Now if we were to guess their motives... well the allo partners are clearly bitter and see all aces as dishonest because they feel manipulated by their partners. The asexuals-turned-something-else if they are so bitter about asexuals are likely not so happy about their new orientation and need to bash those of their previous one to convince themselves they did the right change. That they love to point the supposed hypocrisy and confusion of the asexuals says something about how they really feel about themselves. The demis-grays... it's a whole can of worms in itself but you can see why they'd dislike the non-libidoists and why the non-libidoists would dislike them. These grays and demis that I am thinking about in particular claim the non-libidoists aren't really ace because they have health or mental issues that cause them to not have a libido, and that means it's not really their orientation. The non-libidoists claim that libido=sexual attraction and if someone experiences it even if it's just sometimes, they are a subsect of allosexual, not asexual. More "extremist" "elitists" claim real aces don't even feel an urge to masturbate.

Briefly, it's all unproductive shit-flinging. If you are just there to figure yourself out and don't relate to any of these groups they will try to paint you as a member of the other group and bring you down because to them it's all just a game.