How does everyone make life hard on spoofers/bots/whatever other names they're given?

as soon as I see the main spoofer in my area put a mon in a gym I pull it down even if I am not due to collect and I am seeing him less often (he is in gyms all up and down the coast wish they would just limit the number of gyms people could occupy). although I also will take out a solo blissey if i see it even if it isn't his (he has heaps of them) before it gets any companions just on the balance of odds that it will be me that has to pull it down anyway if i leave it. (there is only one other 30+ mystic in my area and half a dozen mid level ones that to be fair would have trouble taking out a big stack)

Yeah if I know someone is a filthy cheater, I pretty much prioritize taking their gyms down and mostly leave the others alone. Reporting them would be a good idea if Niantic actually did much about them.

You could try some other creative ways (trade secrets!)
1. Gym Block: Need an alt-account of the same team as the spoofer. First, take down his gym. Then, log in the alt-account and put a 10cp mon. Next, train it once to bring up the prestige to 2100. Finally, log back in your account and beat the gym once, to make the gym at 100 prestige. That idiot spoofer may need to train 19 times.
2. Double Blissey Gym Error Block: Need a friend of the same team. First put a lower CP Blissey in. When the spoofer is fighting the gym, put another higher CP Blissey in. Then train the gym once (to 3000+ prestige). In this situation, the spoofer needs to fight 4 Blissey in total and can't do anything in a 3-minute soft ban.