I used to hate the /s but we live in a global world where there may be young people and non native english speakers reading these comments. What is an obvious sarcastic joke to you and I might get lost in translation and on a case like this where actual fatal consequences could follow the joke being misunderstood there's no harm in the community self policing a little to help keep everyone safe and in the loop.
As an ex-young person and a non native english speaker, definitely agree. Back when I was younger and on Reddit I have missed satire on many different jokes cause the intentions of commenters would be hard to deduce.
Thankfully I wasn’t stupid enough to do something like put out an electric fire with water, but there has most definitely been a case of someone killing themselves because they couldn’t tell whether a comment was a joke or not.
FYI, the fat dripping from steak does actually cause flare ups and sometimes even sustained flames in grills. This isn't dangerous in a grill because it's designed to cook with fire at high temps. But it can ruin your steak if you aren't paying attention.