An increasingly large number of people seem to think that 'it's just a joke' is a way to say, 'yes, I was deliberately hurting you, but I think your pain is funny so you're not allowed to get mad about it'.
Madness string 98328
There are reasons for everything. Some are terrible. Some are avoided. For some, it is easier to explain the processes or the commonplace, but these are not reasons, but explanations. The reasons lie behind them.