Though, actually, "Bliar" is rather more insulting than "Alex" or "De Pfeffel", as it carries insinuations on character, which the latter do not.
Indeed, and not merely insinuations, but it seems to be that 'Bliar', morally speaking, is actually defamatory (unless the person using it has very good evidence that Tony Blair actually was a liar. Without wanting to derail the thread too much, it always seemed to me that the evidence was lacking).
If he did indeed grope someone, as alleged, he really should resign as an MP, apology or not.
I wouldn't go that far, given that we don't know anything about the circumstances. From what little we know, it may have been a case, of, a having some (half-drunken) fun and banter with someone that went wrong and he thought the other person wouldn't mind being touched, but the other person actually did mind, and he immediately apologised once he realised. If it was something like that, then demanding that a person resign from their job would seem to me like a total over-reaction. On the other hand, it equally could be something more serious that stretched over a longer period of time and continued after the other person protested - in which case there would be a case for legal action. But, as far as I can see, based on the information currently publicly available, we just don't know what actually happened, or which of those scenarios it was closest to.