<human>: Condense the text into a few key points

Bobby, a kid in my son's kindergarten class, seemed to be a good friend of my son's. But in the last couple of months, he has become bossy, controlling, and downright mean to my son.

Bobby and my son have done numerous playdates at each other's house throughout the school year, and during these playdates I've developed a friendship with Bobby's mom.

Bobby's mom is very outgoing and frequently invites us to do things together, like playdates and sports. But honestly, from what I've witnessed of Bobby's interaction with my son, I feel like my son should get some distance from Bobby. Bobby's constantly putting my son down, lying about him, and trying to get him in trouble. I hate to say it, but Bobby's quite an asshole.

The last couple of times Bobby's mother invited us to do something with them, I turned her down with fake excuses. But I've decided that my son's self esteem is too important, and I no longer want my son hanging out with someone like Bobby. The playdates will have to come to an end.

I am torn between how I should get the point across to Bobby's mom. Should I continue evading her invitations and making up excuses or just tell her the truth about how I don't like the interaction between our sons?

Have any of you been in this kind of situation? If so, how did or would you handle it?
<bot>: Should I keep on making up excuses to turn down playdate invitations or just confront the other parent and say, "Hey the reason we can't do playdates anymore is because your kid is mean to mine"?