Not happy with my dad

I had to leave work early due to fatigue and decided to go ahead and go get my flu and tdap shots since I was planning to sleep this afternoon. Foolishly, I posted as such on Facebook. I woke up to my dad having commented that I shouldn't get it because of the thimerosal (mercury) content being a "10 times dose" for the baby, look it up on YouTube, blah blah. Mind you I see this hours after I got the shot. Quick CDC research and looking up the brand shot I got, only the multidose flu vaccines are supposed to have thimerosal in them and mine was a one-time vaccine. Like?? 😒