I'd agree with Christopher's final paragraph and Jeff Tim. I don't physically foot tap at all -instinctive timing all occurs in my head, but it's a personal thing I don't see any issue with either, as long as it doesn't impact adversly on your playing.
Whilst there are guidelines to which reason (in the logic sense) should be applied, right way, wrong way rigidity is a flawed dogma.
PS. Stumbled across this in my You Tube 'adventures' today. Check out George's right leg action throughout this clip. ðŸ‘😎 Hey! If it was OK for GH..... I'm still working on the " Oooooh!" and head shake. 🤣