The decision by the British Home Office came after the Australian government hastily withdrew Mr. Blanc’s visa last week and forced him to leave the country. Photos he had shared on social media showing him pretending to choke a series of women went viral on Twitter under the hashtag #ChokingGirlsAroundTheWorld. Since then, women and men in several countries where he had scheduled events in the coming months, including Canada, have started campaigns to deny him entry.

For now he has canceled the remainder of his tour. Describing himself as the “most-hated man in the world,” a nervous-looking Mr. Blanc apologized “for everything” on Monday in a CNN interview. He said he had not been choking the women in the photographs but merely had his hands around their throats. It was all “a horrible, horrible attempt at humor” that had been “taken out of context in a way,” he said.

Image In a video available on YouTube, Julien Blanc told an audience of men in Tokyo: “If you’re a white male, you can do what you want.”

“I just want to apologize, you know, to anybody I’ve offended in any way,” Mr. Blanc said.

But as women’s rights and antiviolence campaigners point out, videos and photos of Mr. Blanc explicitly encourage men to harass women and lower their self-confidence in order to have sex with them. One tip suggests that men make derogatory comments about other women’s bodies to flatter their prey. Others recommend pretending to grieve over the recent death of a girlfriend or threatening suicide.

As executive coach for Real Social Dynamics, a dating seminar company, Mr. Blanc promises to teach men how to “make girls beg to sleep with you after short-circuiting their emotional and logical mind” and develop “panty-dropping masculinity” to generate the “powerful emotions girls crave.” Offers range from $197 for 23 instructional videos to a $2,000 dating boot camp.