You can respond to a group message via direct message if you want to keep your response private.
To respond via direct message:
- Tap on the message you want to respond to
- Tap the three dot menu - top right
- Tap 'Reply privately via DM'
- If you've previously direct messaged the member you'll be taken to your existing direct message conversation. If not, you'll be prompted to start a new conversation with them.
- Enter your message in the box at the bottom of the screen
Note that if a member has blocked you, you won't be able to send direct messages.