I have been looking for similar questions on the exchange but I haven't found anything. Although, I have come across discussions on avoiding discussing political issues.
A colleague of mine has placed political badges for an upcoming referendum in the company canteen promoting one side of the campaign. The referendum is not related to our business (the company doesn't have a stake in the outcome). I don't see any policy in place that this act contravenes. This is, as you can all appreciate, a slightly different situation to avoiding discussion. I eat lunch in the canteen 95% of the time.
Everyone on this exchange knows to follow the rule to avoid talking about politics at work. How is a rational person supposed to react to this? Or rather, my goal is to make it clear to people that this practice does not display good awareness without causing disruption.