The new-age dating app is pretty simple: users react (with love or hate) to thousands of topics, like people who don’t signal, beards, and Beyoncé. The result is a matchmaking service based on mutual likes and dislikes. So, if you’re a hater of dirty bathrooms, you’re in good company. In fact, here are the things that we found are the most universally loved and hated throughout the US.

If you’re looking for love, start by cleaning your bathroom . This advice may seem counterintuitive since, let’s be real, romantic pursuits are not typically at the mercy of commode cleanliness (we hope). But, according to hundreds of thousands of people in the US on the dating app Hater , dirty bathrooms are quite literally, the worst.

But not everything is so consistently revered or despised. For instance, having roommates is fun when you’re a young adult, but the older people get, the less they want to cohabitate. What else can we learn about people as they get older? Here are some of the topics that have the biggest shifts between love and hate.

In order for something to be universally loved or hated, it must stand the test of time. If we compare how much teenagers love puppies to how much 30-somethings love puppies, we find the unsurprising result: love of puppies is ubiquitous. Similarly, regardless of age, people agree that drain hair is just gross.

Like age, geography can reveal similarly impactful differences in opinion. If you’ve done any traveling around the US, you’re probably aware that some things that are loved in certain cities are hated in others. For example, the Boston, Massachusetts bubble has way more love for Tom Brady than the rest of the US. Conversely, Buffalo, New York has more hate for him compared to the national average. Some cities in the Southeast US swear by Chick-Fil-A, while those in the Pacific Northwest want none of it. And apparently people in Washington D.C. nerd out over Excel Spreadsheets. Keep looking to find the things that are uniquely loved and hated in each city.

There’s a fine line between love and hate. While there are many topics with little disagreement, others (ahem, butt selfies) are hotly debated. If you’re looking to stir up some conversation amongst friends, family, etc., start by asking how they feel about these polarizing topics.

Methodology

All anonymized data was made available by Hater. In the US there were around 200,000 users and 30+ million love/hate responses to topics.

Change in preference with age was calculated as the percentage of “love” responses for each possible year of age. Only topics in which at least 100 users of each age between 18 and 35 responded with either “love” or “hate” (as opposed to skipping the question). The most universally loved and hated topics were those with the highest and lowest average percentage of “love” responses and the lowest standard deviation across all ages.

Users were considered to be part of a city if they were located within 20 miles from the city’s center. Only topics with more than 100 total responses within a city were considered. Stand-out topics in a city were those that were loved or hated at least 10% more in that city than the rest of the country.

To show the most contentious of the 3,000+ topics in this dataset, only topics with at least 5,000 total responses were included.