He sounds like he’s not asking for help, but same time he feels there isn’t a counter for Laz. So here’s a few to help you out:
Eat the Hunter
Lazarus can revive downed AND dead hunters, but he can’t do anything if the body has been eaten. If you can isolate a victim, eat it and thats an assured Health Tick against the hunter team.
Smell the Feet
If Laz is cloaked, sniff. You won’t see him but you will see foot-prints. Attack where they end and you’ll likely hear a yell of pain.
Look for Fire
Cloaking doesn’t hide your Jetpack flames, so look out for that blue-white glow. That will give you an idea where he is.
Pick on the Medic
Lazarus cannot deal with his own health strikes, and once he dies - every other hunter is free game. I typically recommend going for their Support since they will do everything they can to keep Laz alive. Once the support drops, go for Laz.
Flame breath will reveal a cloaked hunter. Max this at lvl 2 for the extra range and damage and breathe in the general direction of the enemy.
Aftershock also reveals cloaked hunters. Again, max this at lvl 2 and use it where-ever Laz is. I personally use it as a Dive-Bomb (take flight, activate, drop onto the hunters just prior its detonation)
Take the support or trapper down, then wait for to hear Laz’s voice. Fly in with a lvl 3 Warp Blast to deal damage and clense the area. If he runs, drop Supernova and use Abduct to pull him back in.
Lava bomb is your friend as, again, fire damage will reveal cloaked hunters. Better still, push a hunter to an isolated area, get them down with a Lava Bomb, then isolate yourself in with them with a Rock Wall. Use the time to eat the body and Laz will have nothing to revive.
Laz can appear annoying as he takes away a big advantage from the Monster - i.e.: Health Ticks. However this makes him a MAJOR target to be taken down. Dome Fights against him will inevitably result in either biding time to run, or using your full armor to hunt him down and take him out. If you can down Laz twice, he’s very fragile. And once he drops, you can go full beserk on the rest of his team - leaving them alive once down to focus on survivors.
That said, if you think you can’t play against him - that’s your call. He plays different to the other medics, but that doesn’t mean he’s unstoppable. Just as a Monster MUST run from a Maggie or Crow and SHOULD sneak from a Griff or Abe, the playstyle changes depending on the hunters.