Defending myself

Momuh and daduh took me to the park again today.  This will be happening much more often now that the weather appears to be turning cooler.  I was playing nicely with another 12 week old puppy and then when he left, this stupid pitbull came around wanting to play.  It was ok for a bit until it started trying to mount me.  I'm used to this happening considering I'm a pug and I move slow and I'm easy to catch.  The problem is that this stupid pitbull wouldn't stop trying to get after me like that.  Finally I lunged after him several times in order to get him to back off.  Momuh and daduh have never seen me do this before, cuz, once again, I'm a pug and we usually don't do that kinda stuff.  We're laid back little dudes, ya know?  I kept lunging after him and eventually the pitbull's mom came over and said come on, that doggy doesn't wanna play.  Doesn't wanna play?  Doesn't wanna be violated is more like it.  Oh yeah, did I mention that this pitbull is intact?  Ignorant pet owners drive me, momuh and daduh crazy.