"Jumping to conclusions" would be saying that the creators of this site are afflicted with "white knight syndrome." I'm only saying that this text reads as if they were, and it's a case of inelegant wording that could (and should) be fixed.
You're right that it doesn't say that women can't buy it for themselves. But 80% of that phrase is exhorting men to be chivalrous and empower women...the "hey you guys, be a MAN and help out your girls" just feels off in this context. That's all.
I think they're mostly elaborating because the call-to-action is less immediately relevant if you're male. They could add equal text to exhort women to buy the product, but it would just state what's already implied, "Buy some pepper spray to defend yourself against attackers".
In a culture where men have more authority and power than women, part of the responsibility for giving women back control of their lives and bodies rests with the men who currently wield social status. I think encouraging men to support their female friends and relatives is arguably more important and effective than the actual pepper spray, because that's what will create positive social change.
You're right that it doesn't say that women can't buy it for themselves. But 80% of that phrase is exhorting men to be chivalrous and empower women...the "hey you guys, be a MAN and help out your girls" just feels off in this context. That's all.