Not to sure about that, they are just shitcunts who are to much of a pussy to pick on people there own age so they have a go at 14 year olds. They dont get boreed of it at all.
From the sounds of it your are just going to have to deal with them calling you names- sucks for sure but if you really like to ride then you should do it.
Since they're over 18 I wouldn't hesitate to call the Police if they get physical.
There's a time to stand your ground and if they were all the same age as you then the Police wouldn't need to be involved, unless it was a real beat down, but 23 yr olds picking on a 14 yr old is just plain lame and is certainly NOT a fair fight.
I got no problem involving the authorities to level the playing field, so to speak.
I also look at it on a Financial point of view- my taxes helped build the skate park= belongs to me (my kids) as well as any Skater. Your parents did too so it is as much your park as any one else.
I've had a few words with some of them at the Local, easier for me since I'm an old dude and the ones that I have had a "discussion" with were over 18.
Cracks me up listening to some of them bitch- adults, go figger:0
Anyhoo- as others have mentioned you just have to block them out if they're just slingin' words at you.