I kind of wish the PC crowd AND the anti-PC crowd would be more reasonable. Whilst people are getting offended at the silliest of things, people are now getting up in arms that people are upset by legitimately offensive things.
Example of something that is obviously ridiculous - the recent advert "give your daughter a treat for doing the washing up", which was purportedly sexist. That is clearly overzealous - the fact it used a girl rather than a boy was just to make it more personal. There is no previous context to consider, unless you want to be REALLY obtuse and link it to 'women belonging in a kitchen', which would just be stupid as girls in reality do washing up every single day, as do men.
Example of something less ridiculous - the primark 'walking dead' t-shirt which said 'Eenie Meenie mini mo' with a baseball bat. The lyrics are from a well known racial slur - even if you weren't aware of it, it exists. It's not beyond reason to find it offensive if you aren't familiar with the walking dead and that specific context - it looks like something you'd find in a shady part of the deep south. Not something that I would complain about but at least it's understandable.