I really liked the openness he presented about himself. He talked to a bunch of students about things he knew, with little filter, that's it

You're allowed to both like the openness and criticize the character of the speaker who is being open.

Of course, I thought that my comment didn't touch on the critical part about it. I just liked the talk he gave. Should I also criticize when saying 'It's great' so I can express myself in a perfectly balanced way between justice and what people think he said badly? I'm asking an honest question

No but you might think to be less surprised about the repercussions when he's basically suggesting wrecking an entire industry.

Maybe you're not as grounded in the world many people live in.