Really "likes", "slow wifi", etc? It's almost like they are pushing the same false caricature of millenials or young people that the media constantly pushes.
I'd say the stress of most millenials are the stress of most young adults throughout history. Pressures of family building ( marriage, buying a home, career ), terrible compute to work, retirement, taxes, existentialism, etc. These are the everyday stressors. The "career" that turned into a menial job, the mortgage, getting into an age where your older family members are getting sick and dying, worrying about retirement, etc. Also, being more away of politics and political shenanigans as you becom an adult and the neverending news cycle. Sadly, something that seems to get worse and worse as you age.