This is fictional and people judge it based on that. Seo-in have been judged for the exact thing Taegu is doing now, the main difference is when Seo-in did it, Yeongwoon had agreed before but none the less he was crucified by most readers so idk where is the "hypocrisy" coming from.
This is completely different, Yeongwoon never gave Taegu any consent, not in the past, not now and Taegu is forcing himself on him when he is clearly in love with Seo-in and wants to be with him.
Why is Taegu assaulting a boy he watched grow? Now all Taegu supporters disappeared because when it was Seo-in they were all here commenting

All the men in this series from his dad to his uncle to seo in and twin and taegu , all are just shades of red , no one is a green carpet, so why are the Seo in supporters acting like they are better than the rest . You are just choosing a shade of red that you are comfy with .