You should take a stand against all types of violations regardless of where it takes place. Sometimes our work and study environments move into digital forums and even there we should have a welcoming culture and make everyone feel included and safe.
If you arrange a digital study group or digital coffee break, consider being more inviting so that no one will be excluded. Be helpful to those who are less technical than you are.
At Kränkt.se you will find advice about what to do if you have been treated unfairly online, for example, if someone has written a derogatory comment on a forum or posted a picture of you that you do not want to be spread.