Dismissing the opinions of people you don’t agree with is not very intelligent.
Positioning yourself to win an argument closes you off from learning new, possibly important, information.
Holding tightly on to a position means you’re overlooking alternative perspectives, which may significantly improve your knowledge.
Different perspectives can be right or wrong depending on context at different times. Dismissing one approach at the expense of another without full consideration is a lazy, unsophisticated way of thinking, and can be very dangerous.
Open your mind to hear all views, engage in discussion to thrash out ideas in full.
This is the sophisticated, grown up way of finding the best approaches and solutions.
If you can’t debate your point against an alternative, maybe you’ve not fully fleshed it out yet, or maybe it’s just a bad idea.
Better for it to fail early while it’s still just an idea, rather than failing later with real-world consequences, for you and possibly other people.