Fans are so weird about idols in general. We aren't their friends. Lisa confirming her relationship makes me so happy for her, just like Jennie dating Tae or Jisoo dating news (still wonder if break up was real or to appease fans).
As for their friendships, people judging it based on social media is so dumb. They know each other in real life, we don't need to be included in their relationship.
Some so called Blinks have always hated Lisa and used any excuse to criticise her. They are seething at her success.