Once again, you can't "snub" something unless normal circumstances expect you to be there. And that is not established.
>> Presidents don’t always attend a Supreme Court Justice’s funeral.
According to NBC News, only three out of the past seven Supreme Court justice funerals were attended by the President. When Bill Clinton was President, he attended two Supreme Court Justice funerals, but did not attend three others. He was present at former Chief Justice Warren E. Burger’s and Justice William Brennan’s funerals. He did not attend Justices Harry Blackmun or Lewis F. Powell Jr.’s funerals, or Justice Thurgood Marshall’s. Former Vice President Al Gore did attend Marshall’s funeral. Former President George W. Bush did not attend Justice Byron White’s funeral.
However, attending a sitting Justice’s funeral is viewed by some as being completely different in significance.
According to Townhall, this may be the first time in the last 65 years that a current president skipped the funeral of a sitting Justice, although early records are not completely clear. Scalia is the only justice to have died in office since Chief Justice William Rehnquist, who passed away in 2005. Bush attended Rehnquist’s funeral and said the eulogy. When Chief Justice Fred M. Vinson died in 1953, Dwight D. Eisenhower
was photographed at his funeral.
Historically, Presidents’ decisions on attending Justices’ funerals only sometimes seem to be connected to their political leanings. Burger was known to be a conservative, but his court made some liberal decisions while he was Chief Justice, and Clinton, a Democrat, attended his funeral but did not attend the funeral of Democrat Thurgood Marshall, for example. Blackmun was a Republican who became one of the most liberal justices on the Court, and neither Clinton nor Gore attended his funeral either. There doesn’t seem to be a clear pattern as far as Presidents’ decisions about whether or not to attend a Supreme Court Justice’s funeral. << ---
Presidents Don't Always Attend SC Justices' Funerals
"Snub" assumes a premise not in evidence.