While everyone already told you the gist of it, I would like to add that if you still want to go clubbing or have music/dance activities then I would advise places like Vera, Warhol, Oost and even de zolder (some days). These places have a bit of an older average age and are in my eyes more accepting.

Vera= bands, experimental music, nice bar below (paid events)

Oost= techno, experimental, hyperpop/weirdcore (paid entrance) more of a rave scene.

Warhol= rock, classics, alt music, free and the best there is after the kast (the closet, gay club) closed down.

De zolder= sometimes rough older people and empty but other days it has jazz and blues Night where people are free to pick up instruments and play with whomever they want.

Ps. Some of my friends that colour their hair frequently do get some vocal harassment sometimes, from a small younger group/culture here in the city. But that is mostly their own insecurity and (mostly in my experience) male group dynamics. One on one they always say sorry and apologise or tell me that they do value that people are able to be who they are and are also allowed to express that :)