Proper way to disconnect battery neg first neg last

I was told by someone with mechanical ability.
Being that these motorcycles ATV's side by sides have sensitive brains , ECM's etc...
The safest was to disconnect a battery is to disconnect the negative first and when connecting the battery to hook up the negative last.
Please let's hear your ideas.
TY.....

Proper way to disconnect battery neg first neg last

I was told by someone with mechanical ability.
Being that these motorcycles ATV's side by sides have sensitive brains , ECM's etc...
The safest was to disconnect a battery is to disconnect the negative first and when connecting the battery to hook up the negative last.
Please let's hear your ideas.
TY.....