Which is a greater sin on the internet: Having your own opinion or telling others "No"?

Right, there are only two options because this is an "either/or" question. If that's too "restrictive" for you, feel free to keep moving and don't bother to respond.

Having an opinion is not a sin, not on the internet, nor in life, unless your opinion is not politically correct. ACTING ON one that involves harming another person may be.

I am amused at the raft of opinions the left thinks is unsuited for polite discussion. Opposing climate change, advocating self-reliance, opposing gay marriage, being pro-life, all are positions people have taken and been fired for (or made to apologize for) when expressed online. Meanshile, the NAACP official who claims to be black while being white is given a pass because she is liberal. The N-word cannot be used by whites, but blacks use it all the time. Rules apply only to some, and double standards are unremarkable.

We live in an Orwellian era of thought police, enforced by various means, and have departed precipitously from the founding of America as a land of freedom of speech and worship. 1984 is here, and newspeak too- Orwell got the timing wrong. I say, have and express an opinion and be controversial, as long as its entertaining or amusing, and sometimes all is forgiven.