Streisand effect. If you shrug it off, only SP regular viewers will know about the portrayal; if you react, everyone knows both that portrayal and that you whined about it like a little baby.

Depends on age, mostly: older people on all sides of the spectrum find SP crass. Younger people often think it's funny. You can find overwrought editorials about how SP is problematic/written by cucks, as it offends people on both sides on occasion.

I wouldn't say it's marginal, since everyone's at least heard of it. My general impression is that it tends to be watched by young-to-middle age college educated but middle class people, but you'd have to ask the studio to get a solid demographic breakdown.