Why do you think Quagmire hates Brian?

I'd Really Don't Know Why He Hate Brian.Brian is my Man Or Dog I Should Say LOL.And I watched Family Guy New Ep Last Night At the End They were Almost Gonna Made Up When Quagmire Drove Off And Ran over Brian Lol That's My Fact Of Them Two=)

In addition to the habits he mentioned disliking in an actual Family Guy episode, Quagmire hates Bryan because of his wrong place/wrong time comments, like when Bryan mistakes his neice for a boy because of her chemotherapy, or when he sees Quagmire's badly-beaten sister, and complements Quagmire on his taste for rough sex because he didn't know of her relation to Quagmire.

They're are two sides to this:

1.In an earlier episode Brian had made fun of Quagmires family members, one whom was deaf, and the sister who had a badly abused boyfriend.

2.When Quagmires dad had a sex change Brian didn't know who that was and had sex with her.
When Quagmire found out he beat the shit out of him.

Seeing how Quagmire hated Brian way before Brian slept with his dad. This is the reason and only reason...or reason(s).

because he have sex with his daddy

I had no idea he did.

cause he kept making fun of his family you dumb***

I think that quagmire hates brian because brian slept with quagmire's dad.

brian had sex with his dad after he turned into a woman

They actually explained that in one episode its cuz Brian uses peter, he dates idiots, hes boring, he doesnt take care of his son like a crap load of reasons :3

Well as you see above me, those answers are correct.

It's stupid that Seth made Quagmire hate Brian for his personality and habits. Quagmire doesn't know Brian that well and you barely see him talk to him. Its just poor writing.

The other reason is plausible.

because brain did something to him and thats why he hate him