Generalizations that are recognized as "generalizations" (*that is, acknowledged as having exceptions to the rule such as yourself) but still based on a consistent set of behaviors are not per se wrong.
Nationwide and with some regularity:
We have Kerry supporters attacking the police.
We have Kerry supporters attacking little kids
We have Kerry supporters stealing pro-Bush signs.
At some point we have to ask if a significant portion of Kerry's support isn't coming from, well, jerks.
