People need to read the accusations against Lucas again to understand why fans including C netizens and Knetizen are upset about Lucas situation which is different than Chanyeol.
Lucas SCAMMED these women/girls out of a lot of money. He used those women for money and tricking them into believing he loves them and asking them to pay for his service by getting gifts from them.
Chanyeol cheated on his girlfriend but did not scam her out of her money. He is behaviour is wrong. You can say he is a player.