It's intolerant to harsh another's buzz by being a killjoy.
John has just been accepted for his dream job, but John's older friend Ryan knows that getting the job is only the beginning.
Ryan wants John to know that there is still more work ahead.
Ryan tells John he did great, and lets John celebrate for the day before reminding him about the work he needs to do.
Ryan doesn't offer any congratulations, only telling John that he still has a lot of work to do to keep the job.
John sees Ryan as a level-headed friend who gives good advice.
John doesn't celebrate with Ryan anymore, and stops telling Ryan about his life.