You had no risk. HIV is an extremely weak virus that cannot remain active on environmental surfaces, like toilet seats, faucets, etc. You have nothing to worry about whatsoever.
once exposed to air, hiv becomes inactive and UNABLE to infect.
Even if I somehow got blood on my hand after someone had just been in there?
HIV is unable to reproduce outside its living host (unlike many bacteria or fungi, which may do so under suitable conditions), except under laboratory conditions; therefore, it does not spread or maintain infectiousness outside its host.