I touched a friend's fingers . 2 hours later i scratched my anus before washing. he might have touched hpv genital warts before we met. am i infected?

Doubt it: Your question appears to state you put your fingers on your anus (direct contact) to scratch it but the fingers may have been contaminated hours earlier by someone else who touched HPV warts.Strain transfer appears to require direct skin to skin contact and rubbing action with tissue shedding live virus.I doubt that whatever you did qualifies as a means of transfer.