This is a strawman argument. No one cares about other people having and sharing different opinions. However the argument for moderating content on Facebook is centered around misinformation, and incitement of violence. There has now been multiple instances where right-wing populists have posted fake information on Facebook with political consequences. In Myanmar this incited in genocide[1].
This is a disingenuous argument that neglects to include the fact that 'misinformation' and 'violence' are stretched beyond the pale by ideologues in order to justify why something they disagree with politically should be removed on these platforms.
People certainly do falsely assert that things are more harmful than they are to justify taking them down. But it's not disingenuous to point out that there are many cases where disinformation really is deeply harmful (as in it results in death or bodily harm to many, many people).
[1] https://www.nytimes.com/2018/10/15/technology/myanmar-facebo...