Entitled (in this case) is a natural right. No matter what the situation everyone is bound to have their own opinion and thats natural because everybody thinks a different way.
A fact is the truth. Something that happened or something that is. An opinion is your interpretation of the fact. They may all be valid but only the fact is true. If we disagree on what is true then that is our opinion which we are all entitled to. We can think that that is the fact but that is our opinion as well. Which is why we shouldn’t pretend to be right when we are basing our opinion on what we think. Because everybody thinks differently and therefore everybody has a different interpretation of the fact. Stubborn people or people who refuse to listen to what everybody else has to say believe that their opinion is fact.
And it’s definitely ok to express your opinion. Everybody does. I am doing it right now. But when it comes to something as serious as calling a certain hashkafa hellenism it should not be presented as a fact but rather an opinion. IMHO, it should not be said at all.