OP, you had good intentions, but your tone was rude.

[14:57] YOU: You should reread your job skills <BLM>.

It may be true that he/she has no understanding of the skills, but a comment like that is insulting. An alternative could be: "Might I give a suggestion for your rotation?"

This is what prompted his response:

[14:57] BLM: pardon me?

Then you gave him a command. Not a suggestion. A command:

[14:67] YOU: Start with fire III

There is a difference between "Start with fire III" and "You should start with fire III", or "Starting with fire III gives blah blah..."

The first is a command (if you hadn't notice, people online don't like being told what to do), the second is a suggestion, and the third is an explanation. From there, it went downhill.

Had you initially approached it a different way, I'm sure that BLM would've reacted differently.