The interior designer - who is rumoured to have split with fiance Ed Swiderski this week - told a fellow Twitter user that she avoids nasty remarks.
When a follower tweeted her regrets that Harris had to listen to online negativity, the reality star replied: "I don't read it, neither should u! Focus on the positive :) (sic)"
Harris also revealed that she is planning a trip to Europe with her best friends, writing: "A fine end to a crappy little day - just booked a last minute flight sale w/ my three besties to Italy and France. Totally called for."
The Canadian-born star was recently announced as a full-time designer on Extreme Makeover: Home Edition, and tweeted that they needed "volunteers and donations" for a new project in Baltimore.