To be huffy can either mean offended, or quick to take offence. A person may be only a little huffy, a bit huffier than that or the huffiest of all.
The huffiness will become apparent due to the person who’s in a huff behaving huffily.
I was going to illustrate this post with a picture of me looking huffy, but couldn’t find one. I therefore conclude that I’m not even the slightest bit huffish … even when the weather is a touch damp and ever so slightly breezy.