The old studio trick is to sit on a swivel chair so you can face the direction where the strat is quiet
The further away you stand from your amp the less hum you will get also standing with your back to the amp as well helps
F***ing Neon Bar Signs! The Curse of Death for a Strat, Tele or Dano player (me!) Sometimes I have to play my Strat all night at a gig with the pickups in positions 2 and 4 (hum-cancelling) or just deal with the noise, then remember to bring the 335 next time...
Yeah, The problem is I've know this happened but it's particularly bad in the one room in my house know that I'm primarily using for my playing! The good news is it's a room where I am not jumping around live, so I can just sit in a quiet spot!