That's probably the inappropriate part. In fact, your comment would have probably been better off without the entire first sentence. I don't believe the point you're trying to express is reinforced by your introductory sentence at all.
I agree the comment would've been better without the use of the word coward, because it's obviously a charged term and a distraction here.
(See sibling reply if you care about why I chose to use it.)
That's probably the inappropriate part. In fact, your comment would have probably been better off without the entire first sentence. I don't believe the point you're trying to express is reinforced by your introductory sentence at all.