I think having things shouted about your family is over the line. However, if you keep it to that individual, that's part of the job.
I never played nearly at the level of these guys, but I played at a decent level. I've been booed, cussed out, insulted in so many random ways. It never bothered me, it comes with the territory. If you own it and have the right mentality, it's easy to deal with. I'd go back and forth with people in the stands when the oppprtunity arised. I was an outside back or winger so their was plenty of times I was close to the stands. I honestly enjoyed it for the most part. People call you trash and garbage and all sorts of ridiculous stupid things and as a player you just have to say why are you paying for me to play? Why aren't you out here?
A boo or little comments are easy to deal with. The racially charged and stuff about someones family, which I thankfully never had to deal with is the stuff where it gets like the fans are crossing the line.
I don't believe any of that happened here, a boo is harmless. If it bothers you, you are definitely too soft mentally to be playing on that level.