What happens if you plug a 50 Amp RV into 22V welder plug

while not on topic, this incident has made me take a close look at both my subpanels, and both are a mess. ground and neutrals mixed, one enclosure not even grounded.. fun things to fix!

only thing I don't understand, sub panel using plastic conduit,
master has ground/neutral bonded. sub not bonded.

if the conduit had been metal, the sub panel would have inherited the bonding.

what can/am I supposed to do about this?
bond at the sub (no/no)
leave unbonded (maybe?)