On Saturday, Spanish neo-Nazi group Hogar Social Madrid marched through the centre of the city to protest the welcoming of refugees.
Since then, photos and videos of two men kissing in front of the gathered protesters have gone viral on Twitter.
Que foton de. @lunanegra1976
"What a great picture."
One of the men involved, 23-year-old David Fernández, told BuzzFeed News that he and his date, Gregor Eistert, hadn't planned to be involved with the opposition to the march — instead, they had got caught up when trying to find a place to drink.
"We stood in the corner of the square and watched," Fernández said. "Then they stared, yelling things at us like 'faggot.' So I turned to my friend and did what I thought would annoy them the most."
One video of the two men shows their kiss being broken up by police.
El beso gay que desafió a los neonazis en Madrid https://t.co/VUyN5tFgHY https://t.co/mph9cUyMiG
The now-viral kiss has been shared across Twitter, with many adding their messages of support to the two men.
Q caras d retrasados tienen la chusma nazi dl hogar social d Madrid. Estos chicos se lo han pasado pipa a su costa
"“Look at the faces the Nazi scum from Hogar Social de Madrid have. These guys had a great time at their expense."
AMOR ETERNO a David y Gregor. Gracias por ser tan valientes y tan preciosos! <3 https://t.co/B9TMMmcozl
"ETERNAL love for David and Gregor. Thank you for being so brave and so precious! <3"
Precioso y épico momento del beso de David y Gregor frente a la manifestación nazi del sábado en Madrid. #LoveWins
"Beautiful and epic moment of the kiss of David and Gregor against Nazi demonstration on Saturday in Madrid."