More than likely pumping the heck out of your beer DIDN'T over oxygenate it.....
It takes a lot of splashing and other things to do any damage to our beer, someone on basic brewing years ago, (Palmer, or Chris Colby of BYO) said that in order to truly provide enough O2 to oxydize our beers it would take pumping and entire one of our red oxygen bottle/airstones into our beer AFTER fermentation is complete.
Most of the splashing intentional or accidental that we do in the course of our brewing will not harm it...
Including pumping with your auto siphon...
So despite getting bubbles in your Autosiphon, I wouldn't worry.
I know I've done it on numerous occasions...in fact if you look at this thread, especially my initial post in it, I mention that I've done it, to no detrimental effect...
https://www.homebrewtalk.com/f39/wh...where-your-beer-still-turned-out-great-96780/
And beside Oxygenation damage isn't immediate anyway, most of us would have our beer drunk long before it would happen.
So I would just relax it is much hardier that you think it is.