I think anyone and everyone that grew up in the 90's got called that, and not because they thought you were gay, but because that was just a common insult thrown around.
Quite some moons ago, I had befriended my cousin's ex bf. He was a football player and "totally straight", as he would proclaim, though he didn't seem very straight with his cock in my mouth. Made that boy scream, ha. He would call me fag and get very aggressive and try to gag me. I serviced him quite regularly for a period of time. Was as much a release for me as him since I was closeted.
I'd get messages from him on AIM (yep were going that far back, ha) and he'd be like "can I come over and give you this dick, need to bust bad!" Bro would come over at like 2:00 AM while I'm playing Star Craft with the boys, his cock in my mouth, my friends none the wiser, and then bounce after cumming all over me. Fucking amazing times!
Although I guess I am doing him a bit of disservice in how I describe him. He was actually very, very sweet and chill. Our encounters were very consensual and he would often "break character" and ask me if he took things too far to make sure I was not scared or hurt or upset or anything, as he was actually a bit protective over me in truth, ha. He just had a power kink and I gave him permission and endorsed it. Was really hot having him say those things to me. Was equally endearing to me when he checked to make sure he didn't scare me or hurt my feelings as well.
Fag is terrible hurtful word, but reclaiming it in a sexual manner is very arousing and empowering for some people, myself being one such person.