If it's OK for a president to behave in this way, then you better believe this goes all the way down (and every person is abusing public funds to various extents).
Flying first class is for peasants.
Wtf, a politician is allowed to do that? How was the politician able to convince the train to stop? Are there laws enabling politicians to reschedule trains at any point?
Johnson became president when JFK was assassinated. This was within forty years of an attempt on FDR's life--the bullet got the mayor of Chicago instead.
There's nothing third world about it -- for security and logistical reasons it's not like the president can just hop over to the YMCA to shoot some hoops.
So because the president's family is so "trapped" in the White House, special accommodations get made. And remember, this is their home for 4–8 years.
This isn't building palaces with gold sculptures of themselves or anything. And improvements get kept for the next president.
This particular story, however, seems presumably greatly exaggerated for comedic effect (if there's any truth to it at all).
This doesn't even count as reading between the lines, they're obvious implications from the language in the article.