The former Leeds striker was barracked when he came off in the second half in the 1-0 defeat by Fulham.
Pulis told BBC Radio Stoke: "It is disappointing. You do not want to hear that - certainly not at the moment when our supporters are getting so many plaudits.
"I thought Richard did well, he worked hard. He puts in a shift all the time and is an honest kid.
"He came on a free transfer and has been a great signing.
"He helped us get promoted and fingers crossed he will help get us established in the Premier League.
"For that people should respect him and get behind him."