I'm going to honk at an old man blocking the lane
Why would you want to honk at him? He's just old!
Because he's a moron.
It's rude to honk at anyone, let alone an old man just because he's blocking the street. Sometimes older people need a little extra time to do things, so it's expected that you'll be patient with them. Plus honking at the old man won't make him go any faster.
I hate old people so I honked at him anyway.
Did honking get you anywhere? I think that you should have tried to be just a little bit more patient with him. It is not very nice to honk at the elderly.