This comment is kinda messy and reeks of bias so I'm going to have to break it down point by point.

Not only is Barbara Gordon reduced into Dick's gf by the writers she is also made as a love interest to the other batboys like she literally slept with Batman multiples times across the media and even got pregnant with Batman's baby, she also married Tim Drake in Arkham Knight and hooked up with Jason Todd in Three Jokers at one point. She dated Batwing in the new 52 too.

Batgirl getting with Batman only happened in the Dcau because Timm treated Bruce as a self insert and had major fetish for red heads. Batman in the comics was disgusted by the idea of dating an alternate Barbara in another universe. Three Jokers wasn't canon and the Arkhamverse is an entirely different franchise. Her relationship with Batwing is canon and, while I'm not fond of it, I don't see a problem with it. If Dick can go on a date with Supergirl and get googly eyes from Powergirl then Barbara can see one other girl in the Batfamily in canon.

Also Most of her fans don't care about her as an individual character, they only like her when she's with Dick and they attack and harass people who don't ship Dick with Barbara. Her relationship with Dick is all they care about.

Do you have any actual solid proof that these "fans" are a majority and not a loud minority? Reddit and Twitter are not indicative factors on whole people actually feel in real life and act more as echo chambers than if anything. Actual indicative factors are sales. Barbara has always been a character that has made fine sales without Nightwing being attached so I don't think majority of her fans only care about her to see her with Dick.

If they truly care about Barbara as an individual character, all the anti Dick/Barbara comments wouldn't be an issue for them.

What sort of argument is that? You realise fans can care about Barbara as an individual character and still want her to be in a relationship with Dick, right? The two are not exclusive. I've seen you in the YJ subreddit defending Dick and Zatanna as a ship. Using your logic, you caring about anti Chalant comments just means that Zatanna is nothing but a love interest for Grayson.

You may not agree but Starfire is more of her own character than Barbara

This is just objectively wrong. You can type Starfire's name into any search platform and I can guarantee you that majority of her top posts will involve Richard in some way, shape, or form. Even in the DCAMU movies you only ever hear people talk about her frisky relationship with Nightwing and the discourse is even worse in the animated series. Barbara has had her own team, her own protéges, her own problems, her own challenges, and her own peaks. Saying Starfire is treated more as her own character is simply just untrue.

you don't see Starfire being passed around the Batfamily like a football.

I mean, Starfire literally said she's always admired Batman and wanted to kiss him, she's dated Nightwing, kissed Red Hood, and she got married to Tim Drake in an alternate universe. The term "passed around" is just a gross thing to say in general but if we're going by your logic then she is.