SacMomsClub.com

I haven't posted on here in a good long while and wasn't sure where to ask this, but here goes:

My husband has a friend, an older woman with whom he used to work. They're both in the same field and like to talk shop a lot. She shares a house with her longtime partner. Anyway, this friend never had kids, and tolerates them at arm's length.  We stay with them sometimes when we want to visit their area, and they've been unfailingly gracious about it. 

My nine year old son who is gregarious and outgoing, loves to talk.  We were all sitting around the table and he was talking about something, when he got all excited and let out a screech..right near this friend's ear.  I was sitting next to him and got a good earful too. What I didn't see was her suddenly push him away from her--not a hard shove, but a push nonetheless.  She apologized immediately and said it was a reflex action. I told my son to apologize but I know he doesn't scream in people's faces on purpose.  I've talked with him about this before, to ask him to try and "tone it down".  My husband said nothing to her.

I accepted the woman's apology but now I'm uncomfortable bringing my son back to her house.  Am I being nitpicky about this, or should I let bygones be bygones and continue to bring my son to her house ? She irritates me sometimes as well with her remarks
and I also feel she tolerates me and the kids for the sake of her friendship with my husband.  Any thoughts, advice, etc. would be appreciated. Thanks.