If someone is constantly messaging you abuse and stuff, then fair enough block them, but, I have found my times, me simply disagreeing with the asker (even politely) is enough to get you blocked.
People who block just because They don't agree or get "hurt feelings", in my opinion anyway, just need to man the fuck up and be able to take some criticism, there is no "block" option in real life so doing it online seems pointless.
Each to their own though mate, personally I have never blocked anyone, and in my 1+ year on this site I have been given serious shit.
I guess some people are just more sensitive to things online, (no offence to yourself intended btw).
lol considering the types of people on this site, I'm not surprised, nor would i be if you said you had 101 on your list. there is not sudden jump in assholes. it's just something in some people that remains dormant for some time until they snap.
the other thing i've noticed with certain users here is that they come on here all kind and stuff, then over time they become absolutely rude to everyone as a way of establishing presence. just doesn't make sense to b like that unprovoked.