"I disagree" is probably a better way to put that. Especially if you're going to back it up with opinions.
Everyone is entitled to their opinion, but opinions can actually be wrong.
"someone else
needs to front-line fight", "a cleric that refuses to heal ...
would be bad for the group" are claims (emphasis mine). They aren't the same words or meaning as "I don't like clerics that refuse to heal", "I enjoy fights where there is a front-line fighter". The second set of statements are "my opinion"; someone's personal preferences. The first set of statements are worded as "this is how reality works".
If someone is allowed to make claims about how reality works, others can say "no, that isn't how reality works". Anything else is madness.
I described actual, concrete, in-play experiences backed up with game mechanics about why a cleric rarely healing is wise - the opposite of "would be bad", if (say) your goal is to defeat monsters. Because killing a monster (or shutting it down) leads to better survival and victory than partially slowing down its damage output in many situations.
This is backed by many, many other player's experiences, in this very thread. I even described some situations where it is wise to heal as a cleric, some of which are build-dependent.
This is not "my opinion", it is a reasoned argument. One where I included nuance and detailed where my reasoning could very well be wrong, including in my premises.
Is it perfect? no. But it sure isn't "a cleric not healing would be bad", which is what I'm saying is wrong.