Why feminism is getting toxic day by day?

As a whole, it's not. It's a useful term to remind people that women's rights aren't assured and that vigilance is required. But like every group, there is a very vocal minority that tries to co-opt the larger group to try and mold it into their own vision. Then people who are against said group focus on those outliers and give them megaphones to make it sound like they really do represent the group. And then they get used as strawmen to attack the movement as a whole.