A pro says my HTML/CSS approach sucks. What should I do?

I am having a drama at work, and I don't know how to deal with it.

I began learning to code HTML/CSS about a month ago because my boss wanted me to become an in-house web guy. I learned a lot in this forum. Then, last week, my boss decided to bring in outside professional help for it.

The guy LOVES Bootstrap and uses an app called Pingendo to build prototypes and tweak the code in Brackets. That's all he does as far as I could tell. He has been literally mocking me for saying many HTML5...

A pro says my HTML/CSS approach sucks. What should I do?

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