I don't really go to our dog park much anymore. But we generally have an awesome group of owners and dogs that frequent ours.
I have made friends with a lot of the owners and when we see people who have dogs that get snappy or aggressive we work together to send them packing. The park has the rules posted that simply states "no aggressive dogs allowed" and we are able to call animal control if the problem elevates. I'd look into the rules at your park if they are posted.
It has really worked at our Bark Park to weed out the people who should not be bringing their dogs there.
I have made friends with a lot of the owners and when we see people who have dogs that get snappy or aggressive we work together to send them packing. The park has the rules posted that simply states "no aggressive dogs allowed" and we are able to call animal control if the problem elevates. I'd look into the rules at your park if they are posted.
It has really worked at our Bark Park to weed out the people who should not be bringing their dogs there.