We're not in Rockville, but in our town, skills are NOT required or expected in first grade!!
Most kids that age have never played before, and the kids who "played" in kindergarten or pre-K are still very much beginners.
To me, the father you spoke with is an example of what's wrong with kids' sports these days. Too many parents take it all so seriously and use it as yet another way to demonstrate status and exclusivity. Ugh.
We pay attention to which parents -- and coaches -- think/act like that and then request to be on other teams.
Through word of mouth, we've found the "low key" teams within our town league. And our kids don't do travel (some 1st graders and many 2nd graders do!)
Our kids have learned a TON from their coaches and also had a great time. If they turn out to have massive baseball talent, I assume that will reveal itself in time. More likely, they'll just be out there having fun with their friends.